What fundamental concept explains why we do not sense the Earth's constant spin?

Answer

The human body only senses changes in speed or direction (acceleration)

The fundamental reason for unawareness is that the human body, and everything else, is only capable of sensing acceleration, meaning only changes in speed or direction are perceived, not constant velocity.

What fundamental concept explains why we do not sense the Earth's constant spin?
physicsEarthrotationmotionperception